User guide

Canopy System User Guide Co-locating Modules
pmp-0229 (Mar 2013)
149
To use English standard units to find the angle of elevation, use the following formula:
Where:
Is:
B expressed in feet
A expressed in miles
The angle of depression from the higher module is identical to the angle of elevation from the
lower module.
Co-locating Modules
A BH and an AP or AP cluster on the same tower require a CMM. The CMM properly
synchronizes the transmit start times of all modules to prevent interference and desensing of the
modules. At closer distances without sync from a CMM, the frame structures cause self
interference.
Furthermore, a BH and an AP on the same tower require that the effects of their differing receive
start times be mitigated by either
100 vertical feet (30 meters) or more and as much spectral separation as possible within the
same frequency band range.
the use of the frame calculator to tune the Downlink Data parameter in each, so that the
receive start time in each is the same. See Using the Frame Calculator Tool (All) on Page 542.
APs and a BHS can be co-located at the same site only if they operate in different frequency band
ranges.
Where a single BH air link is insufficient to cover the distance from an AP cluster to your point of
presence (POP), you can deploy two BHSs, connected to one another by Ethernet, on a tower that
is between a BHM co-located with the AP cluster and another BHM co-located with the POP. This
deployment is illustrated in Figure 43.
tan b =
B
5280A